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arXiv 1606.07261astro-ph.COastro-ph.GAgr-qc
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具有红移导数的实时宇宙学

Real-time cosmography with redshift derivatives

C. J. A. P. Martins, M. Martinelli, E. Calabrese, M. P. L. P. Ramos

摘要:

被动地跟随宇宙膨胀的物体的红移漂移长期以来被认为是宇宙学的一个关键的模型无关的探测。在这里,我们研究的时间或红移衍生物的漂移测量的宇宙学相关性,认为第一和第二红移衍生物的组合是一个强大的测试的$Λ$ CDM宇宙学模型。特别是,后者可以从一组不同红移处的漂移测量中获得数值。我们发现,在低红移的限制,漂移的导数的测量可以提供一个约束的加加速度参数,这是$j=1$平坦的$Λ$ CDM,而一般$j\neq1$为其他模型。我们强调,这种测量完全在ELT-HIRES和SKA第2阶段阵列调查的范围内。

英文摘要:

The drift in the redshift of objects passively following the cosmological expansion has long been recognized as a key model-independent probe of cosmology. Here, we study the cosmological relevance of measurements of time or redshift derivatives of this drift, arguing that the combination of first and second redshift derivatives is a powerful test of the $Λ$CDM cosmological model. In particular, the latter can be obtained numerically from a set of measurements of the drift at different redshifts. We show that, in the low-redshift limit, a measurement of the derivative of the drift can provide a constraint on the jerk parameter, which is $j=1$ for flat $Λ$CDM, while generically $j\neq1$ for other models. We emphasize that such a measurement is well within the reach of the ELT-HIRES and SKA Phase 2 array surveys.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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